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  1. #1

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    Grumman Cougar twin power needs (Dennis Tapsfield drawing)

    I've been wanting to build this for years - - I enlarged a freebie plan of it from a German magazine (Flug & Model Technik) up to what I thought was 'original' size, roughly two meters. I have a pair of HB .25's that I hoped to use in a twin, the Cougar if possible.

    Has anyone had any experience with this aircraft, and any comments as to the power it needs?

    Thanks very much.
    Peter Havriluk

  2. #2

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    RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

    Peter:

    Cougar. F9F. Swept wing version of the Panther. Single engine.

    There was another very similar airplane with twin engines, but the name escapes me at the moment.

    Bill.
    Real Airplanes have Two Engines
    AMA 25139 - More than 40 years.

  3. #3
    drifter's Avatar
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    RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

    The Grumman American Cougar appeared as a construction article in the August 1980 RC Modeler. They may have reprints and full size plans.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Why do they call it "dead weight" if it keeps your airplane alive?

  4. #4
    zipman's Avatar
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    RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

    LOOKS INTERESTING. Here are the details from the plans store on RCM Magazine site.
    PLAN pl-807
    GRUMMAN AMERICAN COUGAR Our Price $15.00

    by Dennis Tapsfield,

    76" span, 815 sq. in., (2) .20-.25, 6 ch., built-up balsa, plywood, and hardwood, two sheets (2) 34" x 60",


    Issue: RCM 8-80,
    RCM site - http://www.rcmmagazine.com
    Stan

    \"There are old pilots and there are bold pilots but, there are no old bold pilots\"

  5. #5

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    RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

    OK folks,

    Sorry about my earlier comment. I didn't know of the piston twin Cougar.

    Bill.
    Real Airplanes have Two Engines
    AMA 25139 - More than 40 years.

  6. #6

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    RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

    Been a few years since the last post - but I just came across this so - for what it's worth..

    I built the Cougar from RCM plans -
    I'll go into details if anyone is interested.

    IT FLEW VERY VERY VERY WELL.
    I was told it was a fantastic Sky King impersonation(Iknow, not the same plane)
    A never had an engine out with it. (pair of OS engines)
    It was just a great airplane, but I sold it to someone who made an affer I couldn't refuse.

    I have pics and lots of details if anyone is interested - just lemme know -

    Gerry

  7. #7
    Bill Diedrich's Avatar
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    RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

    It's always interesting to read & see pics of different twins, this is
    definately a plane I would consider building as all of Dennis's planes
    seem to be excellent fliers.

    Bill D.
    Founder \"Nosen Cessna 310 Club\"
    Waco Brotherhood # 43
    P-39 Brotherhood # 5

  8. #8

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    RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

    The full-size Grumman GA-7 Cougar was designed from the ground-up as a twin; it's not based on the Tiger/Cheetah. It was very well designed, and has a Vmc a few knots BELOW stall speed. But the timing was terrible, being introduced just as GA was beginning it's long, slow decline. Only 115 were built in 1978-79. It's only been involved in three fatal accidents in the U.S. in over 33 years of flying, an amazing record. I'm sure it would be a fantastic model.

    I'd love to have one, but I can only only afford half of a 1957 Cessna 172 right now! Russ Farris

  9. #9
    Bill Diedrich's Avatar
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    RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)


    ORIGINAL: gerryhdtv

    Been a few years since the last post - but I just came across this so - for what it's worth..

    I built the Cougar from RCM plans -
    I'll go into details if anyone is interested.

    IT FLEW VERY VERY VERY WELL.
    I was told it was a fantastic Sky King impersonation(Iknow, not the same plane)
    A never had an engine out with it. (pair of OS engines)
    It was just a great airplane, but I sold it to someone who made an affer I couldn't refuse.

    I have pics and lots of details if anyone is interested - just lemme know -

    Gerry
    Hey Gerry let's see the pics of the Cougar and the details, "Subscribed"
    Founder \"Nosen Cessna 310 Club\"
    Waco Brotherhood # 43
    P-39 Brotherhood # 5

  10. #10

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    RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

    Bill -
      Thanks for the interest!
    I'll look for the best pics to scan, and try to post them up here this week.
    You know, now if I take a picture it's already digital, finding and scanning older pictures can be a pain!

    Gerry




    Here's a link to some of my the other planes I've had over the years,
    as well as some friends of mine:


    http://www.iinet.com/~gjdonovan/PLANES.HTM

  11. #11

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    RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

    Hi,
    I have the chance to purchase a cougaR WITH 2 X OS 40 FS. Would appreciate some of your photos. What did your weigh? thanks. Bill

  12. #12

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    RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

    I have to dig out and scan to get the photos online, but I hope to do that soon.
    Weight , ready to fly was 8 1/2 lbs. - Yes, I used a bit of contest balsa to keep it as light as possible.
    Power was  (2)  OS .25 FSR turning Master airscrew 9x6's.
    The 2 OS 2 strokes really put out the power, and are the SAME as in the prototype that was featured in RCM.
    I also had the Goldberg retracts, just like the prototype, I would not do that again. (2 retract servos).

    I sold it to the brother of a good friend of mine who "had" to have it right when I needed some cash.
    Anyway, photos to come, and thanks for asking!!

    Gerry

  13. #13

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    RE: Grumman Cougar twin power needs (Dennis Tapsfield drawing)

    I have been told that the one I am interested in is 2.5kg fuselage and 3.2 kg wings. about 6kg ready to fly which is about 13.2 Lbs. Seems a bit heavy. Bill


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